So here's what my excel sheet says. I'm assuming my calculations are correct... or correct enough.
Used, 10k, replace every 10 yrs, avg 100/mo maintenance
16 yrs: 39k
30 yrs: 71k
New, 35k, replace every 8 yrs, 3k for tire and misc maint, sell for 10k,
10k down, 72 mo, 5% int, $442 payment
16...